Paper, fabric, or the like, not sensitive to acids or alkalis.



MAX lEEHR-INGER, OF NEW YORK, N. Y. x

PAPER, FABRIC, OR THE LIKE, NOT SENSITIVE '10 ACIDS OR ALKALIS.

Specification of Letters Patent.

No Drawing. Application filed March 1, 1915, Serial No. 11,844. RenewedDecember '12, 1916. Serial No. 136,548.

To all whom it may concern:

Be it known that I, MAX FEHRINGER, a subject of the German Emperor, atpresent residing in New York, in the county of New York and State of NewYork, have invented a new and useful Paper, Fabric, or the like, NotSensitive to Acids or Alkalis, of which the following is aspecification. I

There are only yery few acidand alkaliproof materials of which thesolutions can be used for impregnating or coating paper, fabrics and thelike to give the latter the same qualities.

Some of these materials are again too expensive for general use, or notodorless, or

one-cannot mix and suspend sensitive colors in the solutions of thesame.

According to the present invention the solutions of the cheap artificialcumaron-rosin are especially suitable for imparting to paper, fabricsand the like resistance to influences of acids or alkalis.

This material is a polymeridof coumarone and indene obtained from thecoaltar-fract-ion boiling between ISO-190. It is a solid of light yellowcolor with a glassy fracture and differs in its chemical structure andespecially in the physical distinctions of solubility very much from theordinary rosin and similar materials. These are wholly or partiallysoluble in alcohol and alkali. The cumaron-ros'in is soluble in neitheralcohol nor alkali and for this last reason very well qualiffied to makethe paper, etc., alkaliproo r 1 This is of great value for papers, etc.,to

be used for wrapping soaps or other chem-' ical products, whoseingredients would otherwise destroy the paper or the colorsof the same.f The novel solution of cumaron-rosin can be made advantageously bydissolving the pulverized material in benzin, gasolene or other suitablepetroleum products, benzol'or like. The following drying processis'pref-' erably carriedout with heat.

A preference of the so manufactured goods is, that they can be made veryinexpensivel-y. As they are further odorless,

Patented July 117, iota.

waterand grease-proof they are suitable for every use.

For some purposes the surface of the paper, fabric and the like may betreated at first with liquids of glue or-albumin or the like, dried and.them dressed or coated with the cumaron-rosin solution. The latter' isalso a good binding substance for colors and by coating the paper,fabrics, or the like-with a colored cumaron-rosin solution it ispossible to produce very good cffects, as characterized by a fine glossyluster.

What I claim as my invention and desire v to secure by Letters Patentis:

Paper, fabric, or the like resistant to acids and alkalis, coated orimpregnated with cumaron-rosin.

. FEHRINGER.

Witnesses H 'AJRTHUR BAUM, W maAM Gmusrrn.

